A finite world can support only a finite population; therefore, population growth must eventually equal zero. - Garrett Hardin

A coldly rationalist individualist can deny that he has any obligation to make sacrifices for the future. By contrast, those who, for whatever reason, regard the resources at their disposal as an inheritance from the past that they feel obliged to pass on to their descendants, have a better chance of producing future generations prosperous enough to be able to continue to wrestle with the problems of increasing the quality of life.

Many of the environmentalists who moved into the environmental movement after Silent Spring ... detested pollution and craved purity. Absolute purity. They wanted to enforce zero tolerance on all environmental pollutants, not just on carcinogens. With friends like these the environment needs no enemies.

The overall system of a sizeable community struggling to survive in a crowded world may be either socialism or privatism. Either system may work, more or less. But, except in non-critical areas of distribution, commonism cannot possibly work for very long.